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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >Influence of Multi-Step Nitriding Condition upon Mechanical Properties of Dilute Mo-Ti Alloys
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Influence of Multi-Step Nitriding Condition upon Mechanical Properties of Dilute Mo-Ti Alloys

机译：多步渗氮条件对稀Mo-Ti合金力学性能的影响

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摘要

Internal nitrided dilute Mo-Ti alloys having a deformation microstructure near the specimen surface were prepared by a novel multi-step internal nitriding at 1423 K to 1873 K in N_2 gas. Thickness of the deformation microstructure can be controlled by varying the nitriding condition. In order to investigate the relationship between the thickness of the deformation microstructure and mechanical properties, static three-point bend tests were performed at temperatures from 77 K to 298 K. Ductile-brittle transition temperature (DBTT) was strongly dependent on the thickness of the deformation microstructure. DBTT of the specimen having the deformation microstructure of 110 μm and 330 μm thickness were 198 K and 170 K, respectively. Yield strangth of these specimens was almost same value at each temperature. The crack initiation area of the specimen having the thin deformation microstructure was an inward recrysallized region, whereas that of the specimen having the thick deformation microstructure was a specimen surface. These results indicate that the difference in the DBTT between the above-mentioned specimens is due to the difference in the fracture strength of the inward region.
机译：通过在N_2气体中于1423 K至1873 K进行新型多步内部氮化，制备了在试样表面附近具有变形微观结构的内部氮化稀Mo-Ti合金。变形微结构的厚度可以通过改变氮化条件来控制。为了研究变形微观结构的厚度与力学性能之间的关系，在77 K至298 K的温度下进行了静态三点弯曲试验。球墨铸件-脆性转变温度（DBTT）很大程度上取决于合金的厚度。变形微观结构。具有110μm和330μm厚度的变形微观结构的样品的DBTT分别为198K和170K。这些样品的屈服强度在每个温度下几乎相同。具有薄的变形微观结构的样品的裂纹起始区域是向内再结晶区域，而具有厚的变形微观结构的样品的裂纹起始区域是样品表面。这些结果表明，上述试样之间的DBTT的差异是由于向内区域的断裂强度的差异引起的。

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